MPICH installation

I searching on internet how to download the MPICH in my laptop, and something is going wrong... I don't know what is happening. I am using ubuntu 18.04. Someone know any good installation video, or doc to use and download it? I am trying to do the installation since 3 days and I can't... Sorry for the silly question

1 Answer

1. Install mpich from the default Ubuntu repositories.

sudo apt install mpich

2. Copy the below hello world C code into a new file named mpi_hello_world.c and save.

#include <mpi.h>
#include <stdio.h>
int main(int argc, char** argv) { // Initialize the MPI environment MPI_Init(NULL, NULL); // Get the number of processes int world_size; MPI_Comm_size(MPI_COMM_WORLD, &world_size); // Get the rank of the process int world_rank; MPI_Comm_rank(MPI_COMM_WORLD, &world_rank); // Get the name of the processor char processor_name[MPI_MAX_PROCESSOR_NAME]; int name_len; MPI_Get_processor_name(processor_name, &name_len); // Print off a hello world message printf("Hello world from processor %s, rank %d out of %d processors\n", processor_name, world_rank, world_size); // Finalize the MPI environment. MPI_Finalize();
}

3. Change directories to the directory which contains mpi_hello_world.c, then compile and run the code with the following commands.

mpicc mpi_hello_world.c -o hello-world
mpirun -np 5 ./hello-world